碰撞式微型压电风能采集器实验研究

摘要

为提高基于风致振动机理的微型风能采集器在低风速下的输出功率,设计了一种新型的碰撞式微型压电风能采集器.采集器主要由圆柱形钝体、铰接分隔板、压电悬臂梁和支架组成.通过铰接分隔板和压电悬臂梁的碰撞有效降低了采集器的工作风速.加工制作了采集器的原理样机并在小型风洞内进行了实验测量.通过实验发现分隔板与压电片横向间距对采集器的工作风速和输出功率有很大的影响.压电悬臂梁自由端添加质量块可以提高输出功率.风速15 m/s、外接200 kΩ优化负载时,采集器最大输出功率为64 μW.%To improve the output performances of wind energy harvesters under low speed wind,a piezoelectric wind energy harvester based on impact was proposed.The harvester consists of a cylindrical bluff body,a hinged-splitter plate,a piezoelectric composite cantilever beam and a fixture.By utilizing the impact between the splitter plate hinged on the cylindrical bluff body and the piezoelectric cantilever,the working wind speed is effectively decreased.The prototype of the wind energy harvester was assembled and measured to evaluate the performances.Experimental results showed that the initial distance between the splitter plate and the cantilever beam significantly affected the working wind speed and the output power of the harvester.The proof mass on the piezoelectric cantilever can increase the output power.The measured maximum output power of the wind energy harvester was 64 μW for a matched resistor of 200 kΩ when wind speed was 15 m/s.